Table 1. Generalised household composition logic model.

HH Size	One-generation (Binary code: 100)	Two-generation (Binary code: 110)	Three-generation (Binary code: 111)
1	Lone dwelling
2	Cohabiting partnerships	Single-parent families
3	Larger adult groups/shared residences: house sharing professionals student accommodation care homes	Child & parent relationships: multiple combinations of residents including single-parent families two parents, 1 to 5 children other combinations and ability to split by age-based measures, e.g. ‘adult only’ or ‘family’ households	Multi-generations: child & parent & grandparent other combinations of non-family members
4+